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Finding the Fourth Proportional to 612.15, 844.59 and 391.42

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Solution

The fourth proportional to 612.15, 844.59 and 391.42 is: 540.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.15 : 844.59 = 391.42 : x
  2. Step 2: Convert to fraction form
    612.15/844.59 = 391.42/x
  3. Step 3: Cross multiply
    612.15x = 844.59 × 391.42
  4. Step 4: Simplify right side
    612.15x = 330,589.42
  5. Step 5: Solve for x
    x = 330,589.42/612.15
  6. Step 6: Final answer
    x = 540.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.